CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

A light weight boy holds two heavy dumbbells of equal masses with outstretched arms while standing on a turn-table which is rotating at an angular frequency ω1 when the dumbbells are at distance r1 from the axis of rotation. The boy suddenly pulls the dumbbells towards his chest until they are at distance r2 from the axis of rotation. The new angular frequency of rotation ω2 of the turn-table will be equal to

A
ω1r2r1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
ω1r21r22
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
ω1r1r2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
ω1r22r21
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B ω1r21r22
Use the principle of conservation of angular momentum I1ω1=I2ω2
ω1r21=ω2r22
ω2=ω1r21r22

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Rotational Kinematics
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon